On the Differential Planar Distance Measurement of HRSI Images

摘要

This paper presented a method for precisely computing the ground 2D size of any pixel in a satellite image received by a push-broom linear array sensor, and further calculating the planar distance between any two pixels in the image. The algorithm is deduced from the imaging principle of linear array sensors, with consideration of the arc of the earth's surface, the height of ground, and the light refraction caused by the air. The author used the method to measure the ground planar distance between two pixels in a Worldview-1 image, compared with the site measurement, the errors were less than the size of pixel. As the computation is based on the instant position and orientation of the sensor, the method is useful for local small area measuring and real time measuring.